A 32-year-old man was arrested on suspicion of making mass-shooting threats against a Waste Management facility twice since March, Phoenix police said Tuesday.

Jarrell Stephens is suspected of posting a threat of a mass shooting against the Waste Management Facility at 2625 W. Grandview Road, on March 7, prompting an investigation and spurring upgraded security protocols at the facility, police said.

Phoenix police and the Federal Bureau of Investigation investigated the incident.

Police said Stephens is suspected of making another online threat last Wednesday, including a list of names of employees at the facility in his post.

On the same day, police responded to the facility after receiving reports of shots fired there, Phoenix police Sgt. Vince Lewis said. Officers arrived and soon determined the call was a hoax and no shots were fired, but the incident prompted Waste Management officials to again enhance their security measures.

Police identified Stephens as the suspect involved in both incidents on Thursday and he was located and arrested without incident, Lewis said.

Stephens was booked on suspicion of creating a hoax, threats, computer tampering and harassment. He also was booked for interfering with judicial proceedings in an unrelated incident.